MadSally

I am retro fitting a 429 into my 65 Mustang.
I have done the Mustang II front end conversion, added the chassis strengthening kit, coil over shocks and will be putting either true traction bars or a four link rear end in it.
My question is regarding the springs.
I originally ordered a replacement set of leafs from Mustangs Unlimited.
I now am wondering if I need to go heaver (if there is a heavier set that will fit) or if I need to do an add a leaf kit.
Any help would be appreciated.
Thank you,
MadSally

88 orangepeel notch

Welcome to the forum, glad to have you.

I think a new set of leafs would be fine for the rear, it's the front spring rates that may need tweaking.

Good luck with the project.

MadSally

Thank you for the response.
I believe the front end issues have been addressed as the Mustang II front end has six way adjustable coil over shocks.
My concern with the rear springs is just because of the torque being added with the big block. I didn't know if Ford increased the springs for the Boss 429 because of this or not.
I'm putting a lot of time and parts into this conversion so I don't want to miss something silly.

88 orangepeel notch

Ohhh, I see.....and I still think the stock replacement leafs will be fine yet.

But I'm no expert on the older Mustangs. There is a Tech section devoted to the older, classic Mustangs. You could try asking this in there. You'll probably get better advice lol.

Good luck